By surface analysis, *učьstiti (“to respect”) + *-ivъ.
*učьstivъ[1]
singular | masculine | feminine | neuter |
---|---|---|---|
nominative | *učьstivъ | *učьstiva | *učьstivo |
genitive | *učьstiva | *učьstivy | *učьstiva |
dative | *učьstivu | *učьstivě | *učьstivu |
accusative | *učьstivъ | *učьstivǫ | *učьstivo |
instrumental | *učьstivomь | *učьstivojǫ | *učьstivomь |
locative | *učьstivě | *učьstivě | *učьstivě |
vocative | *učьstive | *učьstivo | *učьstivo |
dual | masculine | feminine | neuter |
nominative | *učьstiva | *učьstivě | *učьstivě |
genitive | *učьstivu | *učьstivu | *učьstivu |
dative | *učьstivoma | *učьstivama | *učьstivoma |
accusative | *učьstiva | *učьstivě | *učьstivě |
instrumental | *učьstivoma | *učьstivama | *učьstivoma |
locative | *učьstivu | *učьstivu | *učьstivu |
vocative | *učьstiva | *učьstivě | *učьstivě |
plural | masculine | feminine | neuter |
nominative | *učьstivi | *učьstivy | *učьstiva |
genitive | *učьstivъ | *učьstivъ | *učьstivъ |
dative | *učьstivomъ | *učьstivamъ | *učьstivomъ |
accusative | *učьstivy | *učьstivy | *učьstiva |
instrumental | *učьstivy | *učьstivami | *učьstivy |
locative | *učьstivěxъ | *učьstivaxъ | *učьstivěxъ |
vocative | *učьstivi | *učьstivy | *učьstiva |